>> And how would a DBA know that?
> 
> We'd add a column to pg_class that tracks which page version is in use
> for each relation.

So a relation can't have some pages in Version 9.2, and other pages in
version 9.3?  How will this work for 2TB tables?

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com

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